Plumbers trick needed

I am trying to replace the cup seals and springs in a single handle
delta tub faucet and the seals are behind the ball stem but they are
towards the top inside and when placing the seals in the holes/ports
they drop out before I can get both cold/hot replaced and get the stem
back in. Is there something I can use to hold them in place before i can
get the ball stem in.

I would use silicone grease, myself, to preclude the possibility of
petroleum jelly eating away any rubber or latex items in the assembly.
Silicone grease is also food safe, and generally handy to keep around
for anything used around food.
Jon

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